Carburetor



Dec. 20, 1938. G. w. BAKER 2,140,948

GARBURETOF Filed June 17, 1937 z Sheets-Sheet 1 s f 5 5656.9 56 v 5% 55 H 7 '60 o 6 o 75 7 w v I gwue/wbo n George. alien Patented Dec. 20, 1938 UNITED STATES PATENT OFFICE CARBURETOR George W. Baker, Chester, Ill. Application June 17, 1937, SerialNo. 148,782 1 Claim. (01. 261- 51) This invention aims to provide novel means for breaking up the fuel in a carburetor, and to provide novel means for spraying the broken up fuel, within the air passage of the carburetor, the sprayed fuel being disseminated laterally, instead of-being discharged straight down through the air passage, parallel to the axis of the passage, a more complete mixing of the fuel and the air resulting. 1 V i It is within the, province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the v spirit of the invention.

' In the accompanying drawings:

Fig. 1 shows in vertical section, looking in the direction of the arrows'in Fig. 2, and on the line l-l of Fig. 2, a device constructed in accordance with the invention the butterfly valve being shown in starting'or choked position;

Fig. 2 is a section on the line 22 of Fig. 1;

Fig. 3 is a side elevation of the spraying tube;

1 Fig. 4 is a section on the line 4-4 of Fig. 3.

Figs. 5 and 6 are elevations taken at right angles to each other and showing the mechanism for operating the throttle valve, parts being broken away.

The numeral I marks the body of a carburetor, having a passage 5 for the mixture of air and fuel. In the passage 5 is located a venturi 2. An accelerating nozzle 3 is mounted in the body I and communicates with the venturi 2, nearthe upper end of the venturi. The means for securing idling adjustment is shown at 4 and need not be further described because it is well known to those skilled inthe art.

In the lower portion of the passage 5 is located a throttle valve 6 which is carried by a shaft 1 journaled in the body I. A choke valve 8 is disposed in the upper portion of the passage 5 and is carried by a shaft 9 journaled in the body I. The float chamber or reservoir for the fuel is designated by the numeral l 0 in Fig. 2.

The closure for the float chamber [0 is designated by the numeral H, and carries a tubular guide l2 wherein an operating member [4, in the form of a rod, is mounted for vertical reciprocation. The operating member I4 has a reduced upper end l5, defining a shoulder IE on which one or morewashers l1 rest, the end l5 of the operating member passing through the washers. 5 One end l8 of a laterally extended arm I9 is mounted on the end l5 of the rod l4, above the washers 11. A nut 20 is threaded on the reduced upper end I5 of the operating member l4 and binds the end I8 of the arm I9 against the 10 Washers I1. The nut may be held against rotation through the instrumentality of a cross pin 2| mounted in the upper end I5 of the operating member l4 and engaged in seats in the nut. The washers l1 may be placed either above or 15 below the end l8 of the arm 19, any desired number of washers may be employed, and the washers may be of various thicknesses, the position of the operating member M with respect to the end l8 of the arm l1 being adjusted accordingly. go

The arm I9 is connected to a vertically movable carrier rod 22, connected by any suitable mechanism 23 to the shaft 1 which carries the throttle valve 6, the construction being such that when theshaft 1 is rocked, the throttle valve 6, 25 the carrier rod 22 and the operating member [4 will be moved in consonance.

The. operating member I4 is provided in its lower end with a recess 25, receiving a head 26 on the upper end of a control rod 21. The con- 3 trol rod21 passes through a sleeve 28, threaded into the recess 25 of the operating member l4 andv provided at its lower end with a disk-like baffie 29. The upper end of the sleeve 28 engages the lower end of the head 26 of the control rod 21 and, thus, the control rod is secured to the operating member I4. In order to prevent the sleeve 28 from loosening in the operating member l4, a lock nut 30 may be threaded on the sleeve, the lock nut engaging the lower end of the oper- 4 ating member l4. On the lower end of the sleeve 28 there is a transverse baflle disk 29.

The control rod 21 includes an upwardly tapered portion 3| of considerable length, located immediately below the baflle disk 29, the part 3| being provided at its lower end with a short downwardly tapered extension 32, merging into a reduced stem 33 connected to an upwardly, tapered part 34 having, at its lower end, a depending conical nose 85. The taper of the memher 34 is more abrupt than the taper of the member 3|.

A two-part thimble 35 is mounted in the body I and communicates with the float chamber [0. The thimble 35 isprovided with I chamber 36,

there being an inlet 31 at the upper end of the agitating chamber, and an outlet 38 at the lower end thereof. In idling position, the stem 33 extends through the inlet 31, the tapered part 34 of the control rod 21 is located in the agitating chamber 31, and the nose 85 of the control rod is spaced from the outlet 38, all as shown in Fig. 2.

The outlet 38 is in communication with a T- shaped passage 39 in the body I of the carburetor. The body I has a double-diametered bore 48, which slants upwardly and outwardly with respect to the axis of the control rod 21. Into the bore 40 is threaded a first mixing nozzle 4|, provided near its lower end with a transverse bore 42, communicating with the T-shaped passage 39 in the carburetor body. Within the bore 48, the first mixing nozzle 4| is supplied with an external groove 43, defining a space between the first mixing nozzle and the wall of the bore 40. Air finds its way into the groove 43, through a duct 44 in the body the duct communicating with the passages 45 of a plug 48, mounted in the upper portion of the carburetor body.

Should it be necessary to regulate the air supply in idling, recourse is had to a structure shown in Fig. 2, and including a bore 41 in the carburetor, and leading downwardly to the groove 43 of the first mixing nozzle 4|. Intermediate its ends, the bore 41 is supplied with a seat 48 engaged by the inner endof a tubular valve 49, threaded into the enlarged upper end of the bore 41 for longitudinal adjustment. The valve 49 has a stem 50 extending downwardly into the bore 41, and the valve 49 has side perforations 5|.

The supply of air for idling is regulated by.

threading the valve 49 up or down, with respect to the seat 48, the air entering the upper end of the valve 49 and passing outwardly through the perforations 5| of the valve. The air passes into the lower portion of the bore 41 and moves into the groove 43 of the nozzle 4| through a reducer 53, mounted in the lower end of the bore, 41.

The mixing nozzle 4| has a reduced tip 53, extending into a bore 54 in the carburetor body,

the bore communicatingv with the reduced part,

55 of a passage in the carburetor body, the passage including an enlarged portion 56. There is a shoulder 51 in the carburetor, where the parts 56 and 55 of the passage join.

Against the shoulder 51 ,fits a disk 58.on a second mixing nozzle 59, the. nozzle 59 having perforations 68, it being noted at this point that. the nozzle 4| of Fig. 2 has similar perforations 6|. One end of the nozzle 59 extends into the part 55 of the passage and has a flared inlet 62. The nozzle 59 is received within a casing 63, fitting in the part 56 of the passage and abutting against the disk 58 on the nozzle 59. The casing 63 is enlarged to form a space 64 about the nozzle 59, but the forward .end of the nozzle fits closely in the casing, as shown at 65. The casing 63 is provided with openings 66, establishing communication between the space 64 and a circumferential groove 61 formed in the outer surface of the casing 63. Air is admitted into the groove 61 through openings 68 in a plug 69 mounted in the carburetor body. At its inner end,,the casing 63 has a flared outlet or mouth 10.

The inner end of the casing'53 is reduced in diameter, so that it may extend within one end 1| of a spraying tube extended across the passage 5, the spraying tube, marked generally by the numeral 12, having a solid end wall 13 located in the carburetor body; Into the carburetor body is threaded a closure 14, bearing against the end wall 13 on the spraying tube 12. A set screw 15 is threaded into the closure 14 and bears against the end wall 13 of the spraying tube 12. By means of the closure 14 and the set screw 15, the spraying tube 12, the casing 63 and the second mixing tube or nozzle 59 are held securely in place, in a way which will be understood readily from Fig. 1.

The spraying tube 12 has oppositely disposed openings 16, the end edges 11 and 8| of which diverge downwardly and toward the ends of the tube. A disk-like baflle 18 is disposed transversely of the axis of the tube and is located midway between the ends of the openings 16 in the tube. Longitudinal partitions 19 connect the bafile 18 with the upper and lower walls of the tube 12 and form a longitudinal passage 8|! in the spraying tube. The partitions 19 terminate in alignment with the edges 8| of the openings 16 in the sides of the spraying tube.

In practical operation, when the shaft 1 is operated, the throttle valve 6 is operated also. By means of the mechanism shown at 23, motion is imparted to the vertically movable carrier rod 22, the rod 22 transmitting movement to the operating member or rod M, by way of the arm l9. From the operating member l4, vertical movement is transmitted to the control rod 21. In view of the foregoing, it may be stated that the control rod moves in consonance with the throttle valve 6.

In Fig. 2, the control rod 21 is in the position for fast idling. If slower idling is desired, the control rod 21 is moved downwardly until the part 32 of the control rod cooperates more or less with the inlet 31, and until the nose 85 of the control rod cooperates more or less with the outlet 38. In running position, the part 3| of the control rod extends downwardly through the inlet 31, and the part 34 of the control rod extends downwardly through the outlet 38. The fuel, proceeding from the float chamber l0, enters the chamber 36 through the inlet 31. Owing to thefact that the part 34 of the control rod has a more abrupt taper than the part 3|, there is no choking or back pressure at the outlet 38 and a thoroughbreaking up of the fuel in the chamber 36 is brought about, as the fuel moves through the agitating chamber, responsive to piston suction.

, Fromthe chamber 36 and the outlet 38, the

fuel passesthrough the T-shaped passage 39, into the bore 42, and from the bore 42, the fuel passes through a reducer 82 in the first nozzle 4|, into the nozzle. As the fuel is passing through the nozzle 4|, air is drawn through the passages 45 of the plug 46 and through the duct 44, into the groove 43 of the nozzle 4|, air entering the nozzle by way of the perforations 6|.

The mixture of fuel and air passes out of the tip 53 of the nozzle 4|, into the bore 54, and from the bore 54, the fuel passes into the part 55 of the passage in the carburetor body. The mixture enters the second mixing tube or nozzle 59, by way of the flared inlet 62 and moves through the second mixing nozzle. As the mixture moves through the second mixing nozzle 59, a further supply of air is derived through the openings 68 .of the plug 89, the external groove 51 in the casing 63, the space 54 between the casing and the nozzle 59, and the perforations 68. Leaving the second mixing nozzle 59, the mixture moves by way of the outlet portion 19 of the casing 63 into the right hand end of the spraying tube 12 in is directed downwardly and laterally by the end edges 11 of the opening 16.

Some of the mixture entering the right hand end of the spraying tube I2 in Fig. 4, follows the arrows A and advances, externally of the partitions 19, rather than through the passage 80. The air moving forwardly outside of the partitions 19 is deflected downwardly by the baffie disk 18, and because the edges 8| of the openings 1B slope downwardly and laterally, there is a lateral dispersion of the mixture. The general construction of the spraying tube i2 is such that the mixture does not tend to shoot downwardly in a straight stream through the air passage 5. The mixture, rather, is spread out laterally and enters the venturi 2 or its equivalent over a wide area substantially coincident in extent with the upper end of the venturi 2.

The general construction of the device is such that the fuel will be thoroughly broken up and a better mixture will be the result.

Attention is directed to the disk-like baffle 29 in the fuel reservoir in, this baflle serving to prevent air pockets in the gasoline or other fuel, as

the fuel passes downwardly toward the inlet 31.

Having thus described the invention, what is claimed is:

A carburetor having a source of fuel supply and a main passage for the fuel mixture, a spraying tube discharging into the passage, the carburetor having a chamber supplied with an inlet and an outlet, the inlet communicating with said source, the carburetor being provided with a conduit leading from the outlet to the spraying tube, a control member mounted to move through the inlet and the outlet and having means for regulating the effective areas of the inlet and the outlet, mechanism under the control of an operator for actuating the control member, the spraying tube being extended transversely of the main passage and having openings in its sides, the end edges of the openings diverging in the direction of flow through the main passage, the spraying tube being provided with a transverse baffle located intermediate the ends of the openings, and being provided with a longitudinal passage leading through the baffle, the passage communicating with that end of the spraying tube which first receives the fuel mixer, and being laterally open adjacent to said end of the spraying tube, whereby some of the mixture will pass outwardly and engage the baffle, the balance of the mixture moving through the longitudinal passage.

GEORGE W. BAKER. 

